Carbureter for internal-combustion engines.



. G. P. BULL. GAEBUEETEE EOE INTERNAL GOMEUSTION ENGINES.

APPLICATION FILED DEO. 16, 1912.

Patented Dec. 9, 1913.

2 SHEETS-SHEET l.

mvENToRew WITNESSES nm' M G. E. BULL.

GANBNNETEN POR INTERNAL GOMBUSTNON ENGINES.

APPLICATION YILED DBO.1G, 1912A 3. 1 0u NHL 9.., C. no D d e t n .w nw P 2 SHEETS-SHEET 2.

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WTNES coLuMmA PL/mnuuAPM to.. WASHINGTON. D.c.

UNITED srATEs PATENT oEEioE.

CARBURETER FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Application led December 16, 191,2.

Patented Dec. 9, 1913. seriai No. 737,034.

To all whom t may concern.'

Be it known that I, GEORGE FREDERICK BULL, a subject of the King of Great Britain, residing at Small Heath, Birmingham, England, have invented certain new and useliul Improvements in Carbureters for Internal-Combustion Engines, of which the following is a specification.

This invention relates to carbureters for internal combustion engines, in which an auxiliary `or extra air valve is employed for varying the richness of the mixture according to requirements.

rlhe object of the present invention is to combine the auxiliary air valve with the throttle valve so as to form a combined and self-contained regulator device or fitting for controlling or varying both the quantity and quality of the mixture. According to the said invention, there is mounted upon the throttle valve, which is olf the rotary cylindrical type, an angularly movable auxiliary air valve Voperated independently of the throttle valve and adapted, according to its position, (which is under the direct control of the driver), to more or less close the air passage or inlet side of the throttle valve so as to vary the lamount of air which is allowed to pass into the mixing chamber.

Figure l of the accompanying drawings represents a longitudinal vertical section through a carburcter constructed in accordance with this invention, showing both elements of the duplex throttle and air valve in their closed positions. Fig. 2 is a similar section, but shows the throttle valve partly opened, but with the auxiliary air regulator still closed. Fig. 3 is another similar section, but showing lthe throttle valve opened farther, and the air regulator also opened. Fig. 4 is a section showing the valve actuating mechanism, with the parts in the positions shown in Fig. 1. Fig. 5 shows a similar section, but with the parts in the positions indicated in Fig. 2. Fig. (3 is a transverse section on line fr, Fig. l. Fig. 7 represents a similar section on line 001, Fig. 3.

The same reference nui'nerals indicate corresponding parts in each of the ligures of the drawings.

` The throttle valve 1 is `ol the rotatory cylindrical type litted within a transverse cylindrical part 2 of the carbureter body, and provided, at opposite ends, with pivots or tnunnions 3, fl, mounted in bearings in caps 5, 6, screwed into opposite ends ot' the c asing 2. The latter is fitted with an inner liner 7, partly cut away, and having an aperture 8 opposite to the outlet 9 which is adapted to be connected to the induction pipe ol the ,engine by the clip 10. The valve 1 is provided, as usual, with a through passage 11 adapted to be turned more Vorless into register with the aperture 8 and the passage 12 through which the main air is supplied, so as to vary the quantity of the mixture that is allowed to pass to the engine.

13 is the fuel nozzle, supplied from ljloatfeed chamber 14k, and arranged vertically, its upper end lentering the horizontally disposed spraying tube 15 through which air is drawn by the suction of the engine, so that a flow of fuel is induced from the nozzle 13 and converted into line spray, as it issues :from the `tube 15, said sprayed `l'uel being diluted, and the proper mixture formed, by the main `air supply drawn in through the passage 12. The end of the tube 15 may extend slightly into the interior of the valve 1, which latter is provided with a slot 16 arranged to come opposite the spraying tube when the valve is partially lor wholly closed. Mounted upon the outside of the throttle valve is a rotatory or angularly movable auxiliary air valve 4'comprising a transversely extending shutter part 17, ,curved corresponding to the periphery of the valve 1, and attached at one end to a radial arm 18 provided on a sleeve 1,9 freely movable upon the pivot L of the said throttle valve. To allow oi `the angular movement of the air valve `1'1" the liner 7 is cutaway, shown, so as to form a clearance within which the valve can work. By the adjustment of the angular' position ol this auxiliary valve the eii'ective size of the inlet end of the throttle passage, or the air passage, can be varied, so as to regulate the amount of air that passes the spraying tube 15, and thus the richness of the mixture,

At the end .of the throttle valve a volute coiled spring 2() is provided, having one extremity attached to the sleeve 19 of air valve 17, and the other extremity anchored to a stud 21 on the end face of valve l. The spring, by its contractile action, thus tends to take both the throttle valve 1 and the air valve 17 into their fully closed positions, as in Fig. l, the edge of the arm 18 of the air valve coming against the stud 21, as `shown in Fig. 4, and the edge of the air valve itself coming against the tube 15 and being stopped thereby. rIhe opening of the duplex air and throttle valve is positively effected by Bowden-Wire transmission cables 9.2, 23, having eyed terminals 2a, 25, detachably engaged with studs 26, 27, respectively carried by the throttle valve 1 and arm 18 of air valve 17. The said cables 22, 23, Which are connected to control levers on the handle-bar (in the case of a motor-cycle) or other suitable part, pass through the flexible outer guide members 28, 29, attached to branches 30, 31, on the carbureter body by nipples 32, 33.

By suitably operating the cables the duplex throttle and air valve members can be opened to any desired extent, such as shown in Figs. 2 and 8, to obtain any desired quantity or quality of mixture, according to requirements, and by holding either valve stationary by its cable and slackening the cable of the other valve, the spring 20 Will more or less close the latter valve to the extent permitted by the said cable. rlhus, if the throttle valve is held stationary, and the cable 23 is operated, the air valve 17 Will be l opened, Whereas if the said cable is slackened, the spring Will more or less close the valve, While, on the other hand, if cable 22 is operated. throttle valve 1 will be further opened, or if the said cable is slaclened, then the valve will be more or less closed by the spring. Nhen the throttle is in any particular position the richness of the mixture can be readily controlled by altering the position of the auxiliary air valve to admit more or less air as required. If desired, separate springs may be used for each valve; or the valves may be positively operated in both directions, tWo cables being used for each, one for movino the valve in one direction, and the other for moving it in the opposite direction. The nozzle or sprayer, instead of being of the kind represented in the drawings, may be of the ordinary type in which the rush of air used for forming the mixture induces a flow of fuel which is atomized by the said air.

Having fully described my invention, What I desire to claim and secure by Letters Patent is 1. ln a carbureter for internal combustion engines, the combination with a rotary cylindrical throttle valve mounted upon trunnions at opposite ends and having a straightthrough passage at right-angles to its axis, of a spraying nozzle arranged at rightangles to the said axis so as to direct the sprayed fuel through the inlet end of the thro-ttle valve into the interior thereof, an angularly-movable segmental air valve freely mounted upon the outside of and curved correspondingly to the periphery of the inlet side of the throttle valve so as to Work independently of the latter and arranged to coperate only with the inlet port of the said throttle valve so as to regulate the amount of air passing through the said inlet port, a radial arm mounted freely on one of the trunnions of the throttle valve and carrying the air valve at its outer end, and separate and independent means under the direct control of the driver for operating the air and throttle valves.

2. In a carbureter for internal combustion engines, the combination With a rotary cylindrical throttle valve mounted uponY trunnions at opposite ends and having a straight-through passage at right-angles to its axis, of a spraying nozzle arranged at right-angles to the said axis so as to direct the sprayed fuel through the inlet end of the throttle valve into the interior thereof, said throttle valve being provided With a slot Which registers with the spraying nozzle when the valve is nearly closed, an angularly-movable segmental air valve freely mounted upon the outside of and curved correspondingly to the periphery of the inlet side of the throttle valve so as to Work independently of the latter and arranged to coperate only with the inlet' port of the said throttle valve so as to regulate the amount of air passing through the said inlet port, a radial arm mounted freely on one of the trunnions of the throttle valve and carrying the air valve at its outer end, and separate and independent means under the direct control of the driver for operating the air and throttle valves.

3. In a carbureter, the combination With a sprayer, of a rotary cylindrical throttle valve into one open end of which the sprayer extends, said throttle valve being provided with a slot which registers With the sprayer when the valve is nearly closed, an angularly movable air valve mounted upon and movable over the inlet side of the periphery of the throttle valve to regulate the quantity of air entering the said inlet side of the throttle valve, and means under the control of the driver for directly operating the air valve independently of the throttle valve.

t. ln a carbureter for internal combustion engines, the combination With a rotary throttle valve, of a sprayer arranged at right angles to the axis thereof, an air valve mounted upon and movable over the periphery of the throttle valve to regulate the amount of air entering the inlet end thereof, a spring for moving said throttle and air valves in one direction, and means for positively moving said valves in the opposite direction.

5. In a carbureter for internal combustion engines, the combination 'with a rotary throttle valve, of a sprayer arranged at right angles to the axis thereof, an air valve mounted upon and movable over the periphery of the throttle valve to regulate the amount of air entering the inlet end thereof, a volute-coiled spring having; its ends 1ny hand in presence of two subscribing Wit connected respectively to thelthrottle and nesses. air Valves so as to tend to to ze smneinto their closed positions, and means for posi- GEORGE FREDERICK BULL tively and independently moving said valves Witnesses: toward their fully open positions. HENRY NoRioN SKERRETT,

In testimony whereof have hereunto set WILLIAM STAIKES SKERRETT.

Uopies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

